光电子产业的展望和机遇

激光发明40年来,光电子技术取得迅速发展交得到广泛应用,基础元器件的突破,DWDM全光网络应用将促进信息光电子技术和产业的发展;生物光子学、光纤传感技术等效叉学科有着广阔前景。     

基于频率调制和双冷却通道的机械振子的基态冷却

基于光-电力学系统提出了一个机械振子的基态冷却方案.在该系统中,机械振子的一端通过辐射压力与光学腔耦合,另一端通过电容与超导微波腔耦合,通过对光腔、微波腔和机械振子进行周期性的频率调制将机械振子冷却到基态.采用协方差矩阵的方法对冷却动力学进行了数值模拟与分析,结果表明采用双冷却通道和频率调制所得的冷却速率远高于标准单腔光力系统,并且该系统可有效抑制斯托克斯加热过程,因此本文方案可有效提高机械振子的冷却效率.     

In vivo stratum corneum over-hydration and water diffusion coefficient measurements using opto-thermal radiometry and TEWL Instruments

Skin over-hydration is a common problem that affects many people who wear incontinence pads or diapers. The aim of this study is to develop a new method for stratum corneum (SC) over-hydration and SC water diffusion coefficient measurements using opto-thermal transient emission radiometry (OTTER) and evaporimetry. With OTTER, we can measure the SC surface hydration and hydration gradient. With evaporimetry, we can measure the time-dependent evaporative drying curves of water vapour flux density (WVFD). The combination of hydration results and WVFD results can yield information on the SC water diffusion coefficient and how it depends on the SC surface hydration level. The results show that SC water diffusion coefficient is non-linearly proportional to the SC surface hydration level. The results also show strong correlations between evaporative drying flux measured using the Evaporimeter and surface hydration estimated from OTTER measurements.     

Prospects for Optical Interconnects in Distributed,Shared-Memory Organized MIMD Architectures

The antipodes of the class of sequential computers, executing tasks with a single CPU, are the parallel computers containing large numbers of computing nodes. In the shared-memory category, each node has direct access through a switching network to a memory bank, that can be composed of a single but large or multiple but medium sized memory configurations. Opposite to the first category are the distributed memory systems, where each node is given direct access to its own local memory section. Running a program in especially the latter category requires a mechanism that gives access to multiple address spaces, that is, one for each local memory. Transfer of data can only be done from one address space to another. Along with the two categories are the physically distributed, shared-memory systems, that allow the nodes to explore a single globally shared address space. All categories, the performances of which are subject to the way the computing nodes are linked, need either a direct or a switched interconnection network for inter-node communication purposes. Linking nodes and not taking into account the prerequisite of scalability in case of exploiting large numbers of them is not realistic, especially when the applied connection scheme must provide for fast and flexible communications at a reasonable cost. Different network topologies, varying from a single shared bus to a more complex elaboration of a fully connected scheme, and with them the corresponding intricate switching protocols have been extensively explored. A different vision is introduced concerning future prospects of an optically coupled distributed, shared-memory organized multiple-instruction, multiple-data system. In each cluster, an electrical crossbar looks after the interconnections between the nodes, the various memory modules and external I/O channels. The clusters itself are optically coupled through a free space oriented data distributing system. Analogies found in the design of the Convex SPP1000 substantiate the closeness to reality of such an architecture. Subsequently to the preceding introduction also an idealized picture of the fundamental properties of an optically based, fully connected, distributed, (virtual) shared-memory architecture is outlined.     

光电耦合器件在中高频数字信号传输中应用

对于低频数字信号,光电耦合器件应用起来比较简单,但对于中高频信号。会使产生畸变。为了尽量不失真地传输信号,需要综合考虑充,匹配,寄生电容,极间电容等对信号的影响。文中主要介绍了光电耦合器件在信号隔 中的应用情况,以及一些需要注意的问题。     

基于光学微腔的MOEMS微位移传感器

该MOEMS微位移传感器是一种基于光波导环形谐振腔的悬臂梁式传感器,通过一系列的微加工技术集成制造在SOI材料上.光学微腔是一种新型的光学谐振腔,当其在回音廊模式下(WGM)共振时可以检测到规则的透射谱图,该传感器通过测量透射谱的偏移来确定位移量.利用有限元分析法可以得到悬臂粱结构的最佳尺寸参数,利用时域有限差分方法(FDTD)可以得到环形腔投射谱的偏移特性.当使用跑道型谐振腔时,该新型传感器最高可以探测到10nm左右的位移量.     

双DMD红外双波段场景模拟器光机结构设计

针对常规红外双波段场景模拟器多基于单数字微镜器件(DMD)设计、不能对两个波段进行差异化调制、只满足仿真测试的工作波段需求、实用性差的问题,提出了一种基于双DMD的双通道、共口径、两档变焦、结构紧凑的红外中/长波场景模拟器,并对投影系统、照明系统、双色合束镜等主要部分进行了详细的光机结构设计。光学引擎采用远心光路直接照明DMD靶面,利用空间立体式布局来避免不同光路间的干扰,且使用两块小型金属平面反射镜压缩照明光路以提高系统集成度;采用半运动学弹性夹持方式固定合束镜,重点计算了弹簧夹为得到最小预载应发生的偏转量及其在材料中形成的弯曲应力;利用MATLAB求解出两波段黑体的工作温度,并拟合出经光学系统后两波段辐射出射度与全红外波段黑体辐射出射度的比例关系ψ(T)曲线。测试结果表明,黑体温度为850 K时达到最高表观温度要求,中波图像对比度为250∶1,长波图像对比度为14∶1,满足现阶段红外中/长波场景模拟器的使用要求。     

Development of field‐emission displays

Abstract— FEDs are one of the attractive flat‐panel displays that realize high‐quality motion images and low power consumption. FEDs are constructed by using three elemental technologies: micro‐ or nano‐fabrication technology of emitters, opto‐electronic semiconductor technology of anode patterns, and vacuum packaging technology. Each of the three elemental technologies is essential to realize FEDs. The present status of each three technologies, especially the improvement of Spindt‐type field emitters, the trend of flat vacuum packages, and development of phosphors for FEDs is described in this paper.     

光动态直接全互连多计算机系统结构设计

本提出用２×４×１６通道互连网络模块实现光动态直接全互连多计算机（１６台）小型并行处理系统的结构设计，并提出了适应这种系统结构的冲突处理机制和消息传递机制，以及实现这些机制的硬件逻辑电路和帧格式。     

8μm~12μm红外动态热像模拟器光机结构设计

针对常规红外动态热像模拟器光能利用率低,结构复杂,机加与装调困难,无法模拟地面目标及场景的问题,提出一种基于DMD调制的大视场、易装调、结构紧凑的长波红外动态热像模拟器。模拟器采用场镜与反射镜分离照明与投影光束,光能利用率约为TIR棱镜分光结构的2倍左右,同时针对两者的特殊位置设计了多维微调结构;为避免不同材料间热膨胀系数不同所引起的透镜光学表面受力不均,影响照明均匀性,对照明光学系统进行了热稳定结构设计;利用MATLAB求解出黑体的温度变化范围,并拟合出经光学系统前后辐射出射度的比值随温度变化曲线。温度测试与仿真实验表明,黑体温度从50℃变化为350℃的过程中,仿真背景温度漂移为8.1℃,约为模拟温差的7.84%,黑体温度为400℃时其图像对比度达到0.8以上,满足现阶段红外动态热像模拟器的使用要求。